JPH026976B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a large (large capacity) thermal storage tank for brine that stably supplies stored heat to user equipment for a long time with high heat storage efficiency and little temperature change. .

Conventionally, as this type of large-scale heat storage tank that uses water or brine as a refrigerant, a continuous planar heat storage tank that utilizes the lowest double slab part of a building has generally been adopted (for example, (See pages 90 and 91 of ``Thermal Storage Air Conditioning System,'' published by the Japan Society of Engineering on February 25, 1980). This type of heat storage tank is divided into multiple tanks by partition walls such as beams and beam walls, and communication pipes are installed on each partition wall to communicate between the tanks. By forming a continuous tank through mutual communication through the communication pipe, the amount of heat stored in the heat storage tank can be stably supplied to user equipment over a long period of time with little temperature change. For example, when cooling user equipment by supplying heat (cold heat) stored in a heat storage tank, the refrigerant in the low temperature tank is sent to the user equipment to cool it, and then the high temperature refrigerant is returned to the high temperature tank. If the amount of stored heat is insufficient in this state, the refrigerant in the high temperature tank is sent to the refrigerator, which is a heat source device, to cool it down, and then returned to the low temperature tank to store and replenish cold heat.

However, the conventional type described above has the disadvantage of requiring a large installation area because it is a flat multi-vessel type. It is necessary to provide a full plate and a full plate, which has the disadvantage of increasing costs. Furthermore, in order to form an appropriate flow path, it is necessary to appropriately select the position, number, dimensions, etc. of the communicating pipes, which is a complicated process. Moreover, when it becomes necessary to dispose a communication pipe externally in order to form a proper flow path, it is necessary to take heat-insulating and waterproof measures for the communication pipe, which further increases the cost.

Therefore, it is conceivable to significantly reduce the installation area of the thermal storage tank by using a single vertical brine thermal storage tank as the thermal storage tank. There is a drawback that the gradient of the temperature inside the heat storage tank during heat storage does not move upward in parallel over time, and the heat storage efficiency is extremely poor. Moreover, if the piping (brine cooling piping to the brine cooling refrigerator and brine return piping from user equipment) connected to the top of the thermal storage tank, which is a high-temperature layer, is installed from outside the thermal storage tank, the heat insulation for this piping will be improved. Waterproofing measures are required, and along with this, scaffolding, piping racks, etc. are required on site, resulting in the disadvantage of being uneconomical.

The present invention has been made in view of the above, and in the vertical brine heat storage tank consisting of one layer as described above, the inside of the heat storage tank is clearly separated into a high temperature layer and a low temperature layer in the upper and lower directions by a baffle plate. The heat storage efficiency is high and the temperature of the high-temperature layer and the low-temperature layer is measured and grasped, and the piping that communicates with the high-temperature layer is housed vertically in the heat storage tank. The purpose of the present invention is to provide an economical large-sized heat storage tank that allows the amount of heat storage to be easily confirmed, does not require heat insulation or waterproofing for piping, and requires as little installation area as possible.

In order to achieve this object, the present invention has a configuration of a vertical brine heat storage tank consisting of one tank, including a double plate that partitions the inside of the heat storage tank into a plurality of layers, and at least the uppermost layer and the top layer of each of the layers. A temperature sensor installed on the bottom layer, a suction nozzle installed at the bottom of the heat storage tank and connected to the suction line of the brine cooling refrigerator, and a suction nozzle installed at the bottom of the heat storage tank and connected to the return line of the brine user equipment. a return nozzle to be connected, and internal piping for brine cooling disposed within the heat storage tank, one end of which opens to the uppermost layer of the heat storage tank and the other end of which communicates with the suction nozzle;
The brine return internal piping is disposed inside the heat storage tank and has one end opening to the uppermost layer inside the heat storage tank and the other end communicating with the return nozzle. As a result, the inside of the heat storage tank is made into a vertical multi-layered structure using double plates, and the heat storage efficiency is increased by checking and understanding the amount of heat storage with a temperature sensor.Furthermore, the pipes that should be connected to the high temperature layer are connected to each internal pipe in the heat storage tank. They are arranged vertically inside the room.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a refrigerant piping system for supplying cold heat stored in a brine heat storage tank to a fermentation/liquor storage tank according to the present invention, where 1 is a brine heat storage tank filled with brine, and 2 is a user The equipment is a fermentation/sake storage tank, and 3 is a refrigerator for cooling brine. The brine heat storage tank 1 is a single tank of a vertical sealed type, and at a predetermined height inside the heat storage tank 1, there are round plates 4a to 4d having a plurality of communicating holes at appropriate locations. The inside of the tank 1 is partitioned vertically into a plurality of layers (5 layers in the figure), and a temperature sensor 6a is installed in the lowest layer 5a, which is a low temperature layer, and three intermediate layers 5b, 5c, and 5d. Correspondingly, temperature sensors 6b ₁ , 6b ₂ , 6c and 6d are provided, and a temperature sensor 6e is provided in the uppermost layer 5e, which is a high temperature layer, to detect the temperature within each installed layer. .

Furthermore, a suction nozzle 8 connected to a suction line 7 (for example, diameter 200A) of the refrigerator 3 is provided at the lower part of the heat storage tank 1, that is, on the right side in the figure of the lowest layer 5a. At the same time, internal piping 9 for brine cooling is disposed inside the heat storage tank 1, rising vertically from the bottom layer 5a to the top layer 5e. One end (upper end) of the internal pipe 9 opens to the uppermost layer 5e, and the other end (lower end) is bent rightward in the figure and communicates with the suction nozzle 8. Further, a return line 10 of the refrigerator 3 is inserted into the lower part of the lowest layer 5a. Therefore, by driving the primary pump 11 installed in the suction line 7 of the refrigerator 3, the high temperature brine in the uppermost layer 5e is transferred from the brine cooling internal piping 9 through the suction line 7 of the refrigerator 3 to the refrigerator. 3, cooled by the refrigerator 3 to a low temperature, and then returned to the bottom layer 5a via the return line 10, thereby storing cold heat in the heat storage tank 1.

Furthermore, a return nozzle 13 connected to the return line 12 (for example, diameter 300A) of the fermentation/sake storage tank 2 is provided on the left side of the bottom (lowermost layer 5a) of the heat storage tank 1 in the figure. Inside the heat storage tank 1, a brine return internal pipe 14 is provided which stands up parallel to the brine cooling internal pipe 9.
One end (upper end) of the brine return internal piping 14 opens to the top layer 5e, and the other end (lower end)
is bent to the left in the figure and communicates with the return nozzle 13. In addition, the lowest layer 5a of the heat storage tank 1
Inside is a cooling jacket 2 for the fermentation and storage tank 2.
A suction line 15 communicating with a and 2a is open. Therefore, by driving the secondary pump 16 installed in the suction line 15, the low temperature brine in the lowermost layer 5a is transferred from the suction line 15 of the fermentation/storage tank 2 to the cooling jackets 2a, 2a of the fermentation/storage tank 2. After supplying the cold heat stored under pressure in the heat storage tank 1 to the fermentation/sake storage tank 2,
It is configured to return the heated brine from the return line 12 to the uppermost layer 5e of the heat storage tank 1 via the brine return internal piping 14.

Note that 17 in the figure is a branch line that branches from the suction line 7 of the refrigerator 3 and opens into the lowest layer 5a of the heat storage tank 1;
A three-way valve 18 is installed at the branch part of the refrigeration machine 3 to switch the communication between the suction line 7 of the refrigerator 3 and the brine cooling internal piping 9 or the branch line 17 selectively or for mixed flow. Machine 3
During a predetermined period of time immediately after the start of operation, the three-way valve 18
By connecting the suction line 7 to the branch line 17 and to the brine cooling internal piping 9 during normal operation after the predetermined time has elapsed, the lowermost layer of the heat storage tank 1 is connected immediately after the start of operation of the refrigerator 3. The brine 5a is cooled to ensure a predetermined amount of heat storage in the lower part of the heat storage tank 1 at an early stage. Also, 19 is fermentation and storage tank 2
An expansion tank absorbs the brine that has reached a predetermined pressure in the cooling jackets 2a, 2a through the expansion line 20, and 21 is a brine filling tank that stores brine inside, and when the amount of brine in the thermal storage tank 1 is insufficient, Then, the filling pump 22 is driven to fill the bottom layer 5a of the thermal storage tank 1 with brine, and the expansion tank 1 is filled with excess brine in the expansion tank 19 or due to the opening operation of the solenoid valve 23.
It receives and stores the stored brine in 9. Furthermore, 24 is a safety valve consisting of a relief valve interposed in a relief line 25 that opens at the top of the heat storage tank 1, and when the brine pressure in the heat storage tank 1 reaches a high pressure higher than a predetermined pressure, it opens and the brine is removed. is returned to the brine filling tank 21.

Therefore, in the above embodiment, the lowermost layer 5a, which is a low-temperature layer, is divided by the baffle plate 4a, and the uppermost layer 5e, which is a high-temperature layer, is divided by the buffle plate 4d, and further by the buffle plates 4b and 4c. Since they are clearly separated from each other via the three intermediate layers 5b to 5d, that is, the inside of the heat storage tank 1 is separated into vertical multilayers by the four baffle plates 4a to 4d. The temperature distribution is high in the upper layer and low in the lower layer, and no convection occurs. Moreover, the cold heat is being supplied to the fermentation/sake storage tank 2, and the heat storage tank 1
When replenishing cold energy with the refrigerator 3, the temperature gradient inside the heat storage tank 1 becomes an appropriate state in which it gradually moves upward in parallel over time, and as a result, the temperature at the brine outlet to the fermentation/sake storage tank 2 decreases. remains constant and stable for a long time, increasing heat storage efficiency. In addition, even with a small number of buttful plates 4a to 4d, it is possible to prevent the generation of convection as a vertically multilayered structure and to move the temperature gradient inside the heat storage tank 1 in parallel. Compared to continuous planar thermal storage tanks that require
Costs can be significantly reduced. moreover,
Since the amount of heat storage can be easily confirmed and grasped based on the temperature detection in each layer 5a to 5e by the temperature sensors 6a to 6e, appropriate control of cold energy replenishment is possible.

In addition, since the heat storage tank 1 has pipes to be opened to the top layer 5e housed inside by two internal pipes 9 and 14, these pipes 9,
It is economical because there is no need for heat insulation or waterproof equipment for the 14, and there is no need for maintenance costs for these equipment. Furthermore, when the heat storage tank 1 is installed, piping work to the top layer 5e is not required, and the suction line 7 of the refrigerator 3
to the suction nozzle 8 at the bottom of the heat storage tank 1, and the return line 12 of the fermentation/sake storage tank 2 to the return nozzle 13 at the bottom of the heat storage tank 1 from outside the heat storage tank 1. No racks are required, piping connections can be made with good work efficiency, and it is more economical.

Next, FIG. 2 shows the actual measurement results of the temperature inside the tank with respect to time in a cold heat replenishment state to the brine heat storage tank according to the present invention. The measurement conditions are as follows. In other words, the capacity of the heat storage tank is 160 m ³ , the height (inner dimension) is 16.87 m, and the average load of the refrigerator is 1035.7 Mcal/
H, secondary pump average load 566.4 Mcal/H, chiller average brine flow rate 254 m ³ /H, secondary pump average brine flow rate 167 m ³ /H, height positions of 4 buttful plates 2 m, 6 m, 12 m, 14 m. be. As is clear from the figure, the temperature gradient moves upward in parallel with the passage of time, and this causes the brine outlet temperature (-5.5
℃) can be stably maintained at a predetermined temperature for a long time.

In the above embodiment, the inside of the heat storage tank 1 is divided into the uppermost layer 5e as a high temperature layer, the lowermost layer 5a as a low temperature layer, and the three intermediate layers 5 by four baffle plates 4a to 4d.
However, in the present invention, if the uppermost layer and the lowermost layer are separated by a minimum of two buttful plates, the temperature gradient inside the heat storage tank 1 can be moved upward in parallel with the passage of time. Heat storage efficiency can be increased. However, it is more preferable to use four baffle plates as in the above embodiment because the heat storage efficiency can be significantly increased.

Further, in the above embodiment, temperature sensors 6a, 6b ₁ , 6b ₂ , 6c to 6 are provided for each layer 5a to 5e, respectively.
e was installed to check and understand the amount of heat storage, but
By providing at least the uppermost layer 5e and the lowermost layer 5a, it is possible to grasp the amount of heat storage.

As explained above, according to the present invention, the inside of a vertical brine heat storage tank consisting of one tank is partitioned into a plurality of layers by a double plate, and at least the temperature of the top layer and bottom layer is measured by a temperature sensor. Furthermore, since the piping that should be opened to the top layer is an internal piping that is installed inside the heat storage tank in advance, it is possible to easily check and understand the amount of heat storage and maintain an appropriate temperature gradient with as little installation space as possible. In addition to significantly increasing heat storage efficiency, heat insulation and waterproof equipment for piping that should be opened on the top layer,
It is possible to eliminate these maintenance costs, on-site scaffolding, piping racks, etc., reduce costs, and provide a large brine heat storage tank that is economical and has excellent heat storage efficiency. It is.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a system diagram of a system in which cold heat stored in a brine heat storage tank is supplied to a fermentation/liquor storage tank, and Fig. 2 shows a time period of temperature inside the heat storage tank during heat storage. FIG. 2...Fermentation and storage tank (brine user equipment), 3...Brine cooling refrigerator, 4a to 4d
……Bathful plate, 5a… Bottom layer, 5e… Top layer, 6a, 6e… Temperature sensor, 7… Suction line of brine cooling refrigerator, 8… Suction nozzle, 9… Brine cooling 12... Return line for fermentation and storage tank, 13... Return nozzle, 14... Internal piping for brine return.

Claims (1)

[Claims] 1 A vertical brine heat storage tank consisting of one tank, the inside of which is covered with a plurality of layers 5a, 5.
b... partitioning full plates 4a, 4b..., and temperature sensors 6e, respectively provided on at least the uppermost layer 5e and the lowermost layer 5a of the above-mentioned layers 5a, 5b...
6a..., a suction nozzle 8 provided at the bottom of the heat storage tank and connected to the suction line 7 of the brine cooling refrigerator 3, and a return line 1 of the brine user equipment 2 provided at the bottom of the heat storage tank.
a return nozzle 13 connected to
an internal pipe 9 for brine cooling that opens to the suction nozzle 8 and has the other end communicating with the suction nozzle 8;
A brine heat storage tank characterized in that it is equipped with a brine return internal piping 14 which is open at the end and whose other end communicates with the return nozzle 13.